电站锅炉入炉煤元素分析和发热量的软测量实时监测技术

REAL TIME IDENTIFICATION TECHNIQUE FOR ULTIMATE ANALYSIS AND CALORIFIC VALUE OF BURNING COAL IN UTILITY BOILER

文中提供了一种入炉煤元素分析和发热量的实时监测技术,该技术通过测量锅炉、汽轮机、磨煤机以及空气预热器的运行参数间接实现入炉煤元素分析和发热量的实时监测;它利用煤干燥无灰基元素的组成特性的基础性研究结果和能量守恒原理,从排烟气体成分中提取煤的干燥无灰基元素含量的信息;从磨煤机的运行状态中提取入炉煤收到基水分的信息;通过锅炉本体以及空气预热器的能量平衡分析,采用灰分校正技术,实现了入炉煤元素分析和发热量的实时监测。该技术可以为入炉煤质和锅炉效率的监测提供一种快速分析工具,帮助实现锅炉的优化运行。该技术已经在上应用成功,测试表明,收到基低位发热量的测量误差在?3.17%^+3.83%之间。

This paper presents a model for real time monitoring of element contents and net calorific value of burning coal in utility boiler based on measurable operation parameters of boiler, turbine, mill and air preheater. According to the relationship between elements in dry and ash free basis coal, and energy conservation principle, this model picks up ultimate analysis information of coal from flue gas analysis, and coal moisture information from milling system; checks ash content of coal using energy balance of boiler and air preheater; and consequently realizes the real time monitoring of ultimate analysis and net calorific value of the coal. This technique provides a quick analysis tool for monitoring of coal quality and boiler efficiency, can support optimal operation of the boiler. This technique has been used in 300MW power units, and it is showed that the relative derivation of net calorific value between lab analysis results and model results is in the range of ?3.17%^+3.83%.